7.1.2.5.3 Magnetization curves, hysteresis loops, coercive field, permeability

2005 ◽  
pp. 89-93
Author(s):  
G. Bertotti ◽  
F. Fiorillo
Keyword(s):  
Coercive Field ◽  
Hysteresis Loops ◽  
Magnetization Curves

scholarly journals Аппроксимация влияния эффективных магнитных параметров на коэрцитивную силу нанокристаллических пленок на основе Fe

2018 ◽  
Vol 44 (10) ◽  
pp. 29
Author(s):  
Е.В. Харин ◽  
Е.Н. Шефтель ◽  
В.А. Теджетов
Keyword(s):  
Grain Size ◽  
Saturation Magnetization ◽  
Coercive Field ◽  
Hysteresis Loops ◽  
Anisotropy Field ◽  
Magnetization Curves ◽  
Model Approximation ◽  
Pareto Chart ◽  
Order Polynomial ◽  
Iron Based

AbstractThe magnetization curves and hysteresis loops of Fe, Fe_90N_10, Fe_95Zr_5, Fe_85Zr_5N_10, and Fe_77Zr_7N_16 films were measured for determining coercive field H _c, saturation magnetization M _s, and the rms fluctuation of local magnetic-anisotropy field a ^1/2 H _a of these iron-based materials. A model approximation with empirical second-order polynomial and Pareto chart clearly demonstrates the influence of the grain size, anisotropy field a ^1/2 H _a, and saturation magnetization on the coercive field.

COERCIVITY OF SINGLE PINNING CENTER MEASURED BY HALL MICROMAGNETOMETRY

2004 ◽  
Vol 03 (01n02) ◽  
pp. 87-94 ◽  
Author(s):  
KOSTYA S. NOVOSELOV ◽  
SERGEY V. DUBONOS ◽  
SERGEY V. MOROZOV ◽  
DIRK VAN DEN BERGEN ◽  
JAN KEES MAAN ◽  
...  
Keyword(s):  
Coercive Field ◽  
Domain Walls ◽  
Hysteresis Loops ◽  
Nanometer Scale ◽  
Characteristic Energy ◽  
Pinning Centers ◽  
Garnet Films ◽  
Hall Probes ◽  
Pinning Center ◽  
Characteristic Volume

Nanometer-scale movements of domain walls in uniaxial garnet films have been studied by means of micromagnetization measurements using miniature gold and semiconductor Hall probes. At helium temperatures the domain walls are found to move by discrete jumps, which we attribute to pinning on isolated defects, and we were able to measure local hysteresis loops associated with pinning on individual pinning centers. The temperature dependence of the coercive field of a single pinning center allowed us to evaluate the characteristic energy and characteristic volume of the pinning center.

Influence of Bi3.15Nd0.85Ti3O12 Buffer Layer on Structure and Electrical Properties of Bi0.94Ce0.06Fe0.97Ti0.03O3 Thin Films

2014 ◽  
Vol 703 ◽  
pp. 51-55
Author(s):  
Jia Zeng ◽  
Ming Hua Tang ◽  
Zhen Hua Tang ◽  
Yong Guang Xiao ◽  
Long Peng ◽  
...  
Keyword(s):  
Thin Films ◽  
Electrical Properties ◽  
Buffer Layer ◽  
Current Density ◽  
Coercive Field ◽  
Remnant Polarization ◽  
Sol Gel ◽  
Hysteresis Loops ◽  
Si Substrates ◽  
Sol Gel Process

Bi0.94Ce0.06Fe0.97Ti0.03O3 and Bi0.94Ce0.06Fe0.97Ti0.03O3/Bi3.15Nd0.85Ti3O12 double-layered thin films were fabricated via sol-gel process on Pt/Ti/SiO2/Si substrates. The influence of Bi3.15Nd0.85Ti3O12 buffer layer on microstructure and electrical properties of Bi0.94Ce0.06Fe0.97Ti0.03O3 thin films were investigated in detail. Well-saturated P-E hysteresis loops can be obtained in Bi0.94Ce0.06Fe0.97Ti0.03O3 films with Bi3.15Nd0.85Ti3O12 buffer. The remnant polarization (2Pr) of the double-layered thin films is 112 μC/cm2. The coercive field (2Ec) of double-layered films is 672 kV/cm, which is much lower than that of the Bi0.94Ce0.06Fe0.97Ti0.03O3 thin films. The leakage current density of Bi0.94Ce0.06Fe0.97Ti0.03O3/Bi3.15Nd0.85Ti3O12 double-layered thin films is 4.12×10-5 A/cm2.

Magnetic and Mechanical Properties of Magnetic Glass-Coated Microwires with Different Glass Coating

2005 ◽  
Vol 480-481 ◽  
pp. 293-298 ◽  
Author(s):  
V. Zhukova ◽  
A. Zhukov ◽  
V. Larin ◽  
A. Torcunov ◽  
J. González ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Coercive Field ◽  
Tensile Strain ◽  
Hysteresis Loops ◽  
Mechanical Tests ◽  
Internal Stresses ◽  
Glass Coating ◽  
Prepared State ◽  
Metallic Nucleus ◽  
Magnetic Glass

Glass coated microwires with two metallic nucleus compositions Co57Fe 6.1Ni10B15.9Si11 and Fe36,4Co41,7B11,8Si10,1 with 3 different glass coating compositions (Pyrex – 74.5% SiO2, 15% - B2O3, 3%- Na2O, 2%- Al2O3 1.5% -K2O; Nonex – 73% SiO2, 16.5% - B2O3, 6% - PbO 3 %-Na2O, 1.5% -K2O; and F1 – 70.2% SiO2, 27% - B2O3, 0.8 %-Na2O, 2%- LiO2 1% -K2O;) with very similar geometry (metallic nucleus diameter 7 µm, total diameter 19 µm) have been successfully fabricated and studied. Ferich microwires in as-prepared state show rectangular hysteresis loops, which is connected with the strong internal stresses induced by the fabrication process. Co-rich compositions show inclined hysteresis loop with smaller value of coercive field. The coercivity, Hc, of Co-rich microwires is the highest and of Ferich samples is the lowest in the case of Pyrex coated microwires. The Nonex coated microwires are in the intermediate position while the F1 coated Co-rich microwires have the lowest Hc while the Fe-rich samples have the highest Hc. The mechanical tests show that the best tensile strain yield is observed in samples coated by Nonex glass followed by Pyrex and F1. In this way the variation of the glass coating material allows to tailor both magnetic and mechanical properties of glass coated tiny microwires.

scholarly journals Ferroelectric and Magnetic Properties of Hot-Pressed BiFeO3-PVDF Composite Films

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Annapu V. Reddy ◽  
K. C. Sekhar ◽  
Navneet Dabra ◽  
A. Nautiyal ◽  
Jasbir S. Hundal ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Coercive Field ◽  
Polyvinylidene Fluoride ◽  
Room Temperature ◽  
Magnetic Hysteresis ◽  
Composite Films ◽  
Hysteresis Loops ◽  
Liquid Phase Sintering ◽  
Magnetic Hysteresis Loops ◽  
Ferroelectric Hysteresis

The ferroelectric and magnetic properties of hot-pressed BiFeO3- (BFO) polyvinylidene fluoride (PVDF) composite films have been studied. The BiFeO3 (BFO) ceramics have been synthesized by a rapid liquid phase sintering technique. The X-ray diffraction (XRD) studies revealed that the impure phase observed in pure BFO ceramics was significantly reduced in the composite films. The presence of both ferroelectric and magnetic hysteresis loops confirms the multiferroic nature of the composite films at room temperature. A well-saturated ferroelectric hysteresis loop with a remanent polarization (Pr)∼4.8 μC-cm-2 and coercive field (Ec)∼1.55 kV/cm has been observed in composite thin films at room temperature. The magnetic hysteresis loops were traced at room temperature with SQUID. The remanent magnetization (Mr)∼3.0×10−3 emu/gm and coercive field (Hc)∼0.99 kOe was observed in the composite film. The magnetic polarization of the composite films has found to be enhanced as compared to pure BFO and correlated to reduction in BFO impure peak intensity.

scholarly journals Magnetization curves and hysteresis loops of nanostructured rare earth titanates

2018 ◽  
Vol 185 ◽  
pp. 03005
Author(s):  
Anatoly B. Rinkevich ◽  
Alexander V. Korolev ◽  
Mikhail I. Samoilovich ◽  
Sergej O. Demokritov ◽  
Dmitry V. Perov
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Hysteresis Loop ◽  
Magnetic Moment ◽  
Effective Magnetic Moment ◽  
Pyrochlore Structure ◽  
Hysteresis Loops ◽  
Nanocomposite Materials ◽  
Magnetization Curves ◽  
Crossing Point

Magnetic properties of the nanocomposite materials containing particles of rare earth titanates with pyrochlore structure have been investigated. For the nanocomposites with Gd2Ti2O7, La2Ti2O7 it has been observed that the effective magnetic moment in the nanocomposites differs substantially from that for Gd3+ and La3+ ions. The hysteresis loops was obtained for the nanocomposites with Dy3+, Gd3+, Yb3+, Er+, Sm3+ ions. There is no hysteresis loops for the nanocomposites with La2Ti2O7, Pr2Ti2O7 and Nd2Ti2O7 particles. It has been shown that nanocomposites with Yb2Ti2O7, Dy2Ti2O7 and Er2Ti2O7 particles have one crossing point on the descending branches of hysteresis loop in some temperature range.

Magnetic Properties of Magnetic Hydrogels

2015 ◽  
Vol 233-234 ◽  
pp. 310-313
Author(s):  
L.V. Nikitin ◽  
A.A. Gladkov ◽  
A.E. Korovushkin
Keyword(s):  
Magnetic Properties ◽  
Coercive Field ◽  
Remanent Magnetization ◽  
Magnetic Particles ◽  
Polyacrylamide Gel ◽  
Magnetization Curves ◽  
Iron Particles ◽  
Mean Size ◽  
The Mean

Several samples of magnetic hydrogels (also known as ferrogels) are prepared, and their magnetic properties are examined. Polyacrylamide gel is used as the base. Gel matrices are filled with the nanopowder: iron particles with the mean size about 30 nm. The magnetization curves of the samples are measured at different stages of de-swelling. The dependencies of such parameters of magnetization curves as coercive field, remanent magnetization from concentration of magnetic particles in the sample along the process of drying were investigated.

Comparison of static hysteresis models subject to arbitrary magnetization waveforms

2017 ◽  
Vol 36 (3) ◽  
pp. 774-790 ◽  
Author(s):  
Martin Petrun ◽  
Simon Steentjes ◽  
Kay Hameyer ◽  
Drago Dolinar
Keyword(s):  
Design Methodology ◽  
Hysteresis Loops ◽  
Magnetization Curves ◽  
Hysteresis Model ◽  
Content Type ◽  
The Individual ◽  
Practical Implications ◽  
Excitation Waveform ◽  
Arbitrary Magnetization ◽  
Selection Of

Purpose This paper aims to compare different static history-independent hysteresis models (mathematical-, behavioural- and physical-based ones) and a history-dependent hysteresis model in terms of parameter identification effort and accuracy. Design/methodology/approach The discussed models were tested for distorted-excitation waveforms to explore their predictions of complex magnetization curves. Static hysteresis models were evaluated by comparing the calculated and measured major and minor static hysteresis loops. Findings The analysis shows that the resulting accuracy of the different hysteresis models is strongly dependent on the excitation waveform, i.e. smooth excitations, distorted flux waveforms, transients or steady-state regimes. Obtained results show significant differences between predictions of discussed static hysteresis models. Research limitations/implications The general aim was to identify the models on a very basic and limited set of measured data, i.e. if possible using only the measured major static loop of the material. The quasi-static major hysteresis loop was measured at Bmax = 1.5 T. Practical/implications The presented analysis allows selection of the most-suited hysteresis model for the sought-for application and appraisal of the individual limitations. Originality/value The presented analysis shows differences in intrinsic mechanisms to predict magnetization curves of the majority of the well-known static hysteresis models. The results are essential when selecting the most-suited hysteresis model for a specific application.

On the Relation Between Magnetization Curves and Hysteresis Loops

1933 ◽  
Vol 1 (4) ◽  
pp. 121-121
Author(s):  
Thomas Spooner
Keyword(s):  
Hysteresis Loops ◽  
Magnetization Curves
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